Agenda - Council - 04/11/2017 - Laserfiche WebLink

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4. PROPOSED IMPROVEMENTS 4.1 Street and Stormwater Improvements The four street segments within the Rivers Bend residential neighborhood proposed to be reconstructed include 147th Lane between Xkimo Street and Waco Street, 148th Avenue between Yakima Street and Xkimo Street, Xkimo Street between 147th Lane and 149th Avenue, and Yakima Street between 148th Avenue and 149th Avenue. The scope of the proposed surface improvements is shown in Figure I in Appendix A. 4.1.1 Street Improvements The streets in Rivers Bend are proposed to be reconstructed to match their existing width of 30 feet. All damaged surmountable concrete curb and gutter is proposed to be removed and replaced in kind. A typical section for the proposed pavement street reconstructions improvements is shown in Figure 2 in Appendix A. The proposed reconstructed bituminous pavement design is designed to accommodate a 7-ton design in accordance with the City of Ramsey's design standards. City staff is proposing a pavement section design of 1.5 inches bituminous wear course, 2 inches bituminous base course, over 4 inches of existing aggregate base material after reshaping and compacting the base. The proposed pavement design should result in a minimum pavement life of 30 years, assuming that proactive, regular pavement maintenance treatments are performed during the life of the pavement. While a 60-year design life would typically be targeted for a reconstructed street, this project is not proposing a full street reconstruction due to the good condition of the majority of the existing 30 year old curb and gutter. Therefore, only the bituminous pavement is proposed to be reconstructed at this time as it may make sense to replace the pavement section at the time the rest of the existing curb and gutter is replaced, which may be 30 or more years in the future. 4.1.2 Stormsewer Improvements The existing storm sewer system is in good condition and is not proposed to be improved. The only proposed storm sewer improvements include repairing catch basin castings as needed. No stormwater quality treatment improvements are required for this project since the street is proposed to be reconstructed at its current width. 4.1.3 Geotechnical Considerations WSB completed twelve (12)pavement cores along the streets in Rivers Bend as shown in their Pavement Evaluations and Recommendations report, attached in Appendix D. WSB recommends leaving all intact existing curb and gutter in place, which staff estimates accounts for over 80% of the existing curb and gutter, which is only 30 years old. WSB also recommends reconstructing only the bituminous pavement. In total,this work is estimated to cost about half as much as a total street reconstructions while resulting in a Feasibility Report Rivers Bend Street Reconstructions City ofRamsey Project No.I7-02 Page 6